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java.awt.HeadlessException: 	at java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:207)	at java.awt.Window.(Window.java:535)	at java.awt.Frame.(Frame.java:420)	at java.awt.Frame.(Frame.java:385)	at javax.swing.JFrame.(JFrame.java:174)	at net.java.sip.communicator.plugin.desktoputil.SIPCommFrame.(SIPCommFrame.java:83)	at net.java.sip.communicator.impl.gui.main.MainFrame.(MainFrame.java:180)	at net.java.sip.communicator.impl.gui.UIServiceImpl.loadApplicationGui(UIServiceImpl.java:148)	at net.java.sip.communicator.impl.gui.GuiActivator$1.run(GuiActivator.java:171)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:312)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:745)	at java.awt.EventQueue.access$300(EventQueue.java:103)	at java.awt.EventQueue$3.run(EventQueue.java:706)	at java.awt.EventQueue$3.run(EventQueue.java:704)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:715)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)